Cranes are widely used for lifting and handling machinery in ports, workshops, and construction sites. Crane type: A. Movable: car cranes, crawlers, cranes, etc. B. Fixed type: dock crane, tower crane, gantry crane and so on. The name of the crane is a unified title. Frequently called cranes are mainly car cranes, crawler cranes and tank cranes. Cranes are used for lifting equipment, emergency rescue, lifting, machinery, and rescue. Types of cranes:

Safety Guidelines for Cranes Working Safety Guidelines for Working Cranes Safety Guidelines for Working Cranes 1. Safety Guidelines for Cranes When They Are Overloaded or Being Lifted; 2. The Command Signals Are Unclear and Do Not Hang; 3. The Bundles and Hangings Are Not Secured. Imbalance may lead to slippage. 4. It may not be lifted when someone is hanging or floating. 5, Structure or parts have defects that may affect safety work, or they do not hang when damaged. 6. In case of unclear traction Do not lift objects when they are placed; 7. Difficult workplaces, inability to see the site, hanging objects, and command signals when not lifting; 8. When the edges of the objects to be hoisted are not padded with the bundled steel wires, do not hang them; When lifting heavy objects, do not hang; 10, crane insurance device is not complete, not reliable and not hanging. The concept of a car crane is to combine the car and the crane, and it can be operated in a form without assembly. The advantages are convenience and flexibility, high work efficiency, fast turnaround, and improved work efficiency . The disadvantage is limited by terrain, large equipment (1000-2000 tons) can not be completed. (Maximum tonnage of 1200 tons for car cranes . ) Crawler crane is the abbreviation for crawler cranes. It is a kind of crane that is used as a crawler running mechanism to get off the ground. The advantage is that it can lift heavy weights and can walk. Has a strong lifting capacity. The disadvantage is that it is difficult to dismantle and disassemble, and the boom cannot be freely retracted. The limitation is too strong. Suitable for large factories, working in the factory area .

Crane main performance parameters index: For the boom type crane, its rated capacity changes with the amplitude, and its lifting characteristics index is characterized by lifting torque. The value marked on the plate is the maximum weight. The lifting weight on the crane's placard usually refers to the rated lifting weight of the crane. It should be clearly visible in the apparent position of the crane structure. When the picking device can be placed below the ground or the top surface of the track, the descending distance is called the descent depth. That is, the vertical distance between the minimum working position of the spreader and the horizontal support surface of the crane. The main parameter of the crane is the parameter that represents the main technical performance index of the crane, which is the basis for the design of the crane, and is also an important basis for the safety technical requirements of the heavy machinery.

Lifting weight refers to the weight of the lifting weight in kg or t. It can be divided into rated lifting weight, maximum lifting weight, total lifting weight, effective lifting weight and so on. The rated lifting capacity is the amount of material that can be lifted by the crane together with separable lifting gear or attachments (such as grab buckets, electromagnetic chucks, balance beams, etc.) The total lifting weight is the amount of material the crane can lift with the separable spreader and long-term The sum of the masses of spreaders and plays (including hooks, pulley blocks, lifting wire ropes, and other lifting gear below the lifting trolley) fixed on the crane.The effective lifting weight is the net mass of the material that the crane can lift. The nominal lifting weight usually refers to the rated lifting weight of the crane, which should be clearly indicated in the obvious position of the crane structure.For the boom type crane, the rated lifting capacity is changed with the amplitude, and its lifting characteristics The index is characterized by the lifting moment.The value marked on the plate is the maximum lifting capacity.The total service rating of the spreader and the material quality of the crane with separable spreaders (such as grabs, electromagnetic chucks, balance beams, etc.) From the lifting weight, the quality of lifting material is allowed to be a valid lifting weight.

    Lifting height refers to the vertical distance from the top surface (or ground) of the crane running track to the extreme position on the picking device, and the unit is m. When the hook is normally used, it is counted at the center of the hook hook and loop; when using the grab and other containers, it is counted at the bottom of the container. Falling depth h When the picking device can be placed below the ground or the top surface of the rail, the descending distance is called the descent depth. That is, the vertical distance between the minimum working position of the spreader and the horizontal support surface of the crane. Lifting range and lifting height and the depth of the depression, i.e., the vertical distance between the highest and lowest spreader operative position. Span refers to the type of bridge between the horizontal centerline of the track from the crane operation, the unit is The bridge crane type The distance between the centerline of the trolley's running track is called the gauge of the trolley . The distance between the centerline of the running track of the jib crane running on the ground is called the gauge of the crane. The amplitude of the rotating jib crane refers to the horizontal distance between the center line of rotation and the vertical line of the picking device, and the unit is m. The amplitude of a non-rotating jib crane is the distance between the center line of the spreader and the rear axle or other typical axis of the jib. The amplitude when the boom angle is at its minimum or the distance between the trolley position and the crane's turning center is the maximum; otherwise, it is the minimum amplitude.

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